normal oxygen levels

my oxygen level used to run 98 or99. over the past month it has dropped to 92 & 93.  I tire very easily and get very lightheaded just walking around. Is this do to the drop in oxygen and should I see my doctor

[National Jewish Health]

Tiring easily and getting lightheaded "just walking around" would not be caused by an oxygen level of 92% but the reduction could be a sign of something more serious that is causing these symptoms.  If the oxygen determinations were not performed on the same oximeter, they may not be comparable.  You should definitely see your doctor to have your heart and lungs checked as well as your blood pressure while lying down and standing.

The important question is what has prompted you to check your oxygen levels?  Whatever that was, it may be a clue for your doctor to determine what is happening.  He/she may also want to look to pulmonary emboli, which are clots to the lungs, as a cause of your symptoms.

Good luck.